Added more unit tests for area functions.
Added more unit tests for area functions.

New tests for:
    `area_is_chamber_or_room()`
    `area_is_interesting()`
    `area_is_level_transition()`
    `area_center_point()`

donmccaughey/FiendsAndFortune,donmccaughey/FiendsAndFortune,donmccaughey/FiendsAndFortune